Brake shoe



Aug. 242, 1933. E L HIRVQNEN 1,923,203

BRAKE SHOE Original Filed Jan. 27, 1925 fhveno.

Patented Aug. 2,2, 1933 1,923,203 y n BRAKE snoE Erik J. Hirvonen, Worcester, Mass., assignor, by mesne assignments, to Bendix Brake Com pany, South Bend, Ind., a Corporation of Illinois `original YMinimums January 21,1925, serial No.V

Divided and this application December 31, 1928. Serial No. 329,521

1 Claim.

This invention relates to brakes and is illustrated as embodied in an internal expanding brake for the front wheels of an automobile al though not-limited to such application.

One of the objects ofthe invention is the provision of a brake shoe oi strong yet simple construction that is provided with means by which it can be pivotally anchored to and has good bearing on a support and which is also provided 1o with engaging means for a brake-actuatingy device. Y

A further object is the provision of a brake shoe having an arcuate faced body structure provided with a longitudinally extended strength-` lli ening rib that has spaced and connected arms at one end for pivotal anchorage to a support and has a projection at the other end for engagement with a brake applyingdevice.

A further object is generally to improve the w construction of brakes and brake shoes.

The present application is a division of my copendlng application Serial No. 5,129, led January v2'1, 1925.

Fig. I is a sectional elevation through an internal expanding brake embodying the present invention. y

A Fig. 2 is a section along line 2 2 of Fig. 1.

Fig. 3 is a perspective view of the brake shoe embodying the present invention. Fig. 4 is a section taken along line 4-4 of As here shown the brake includes the rotatable drum 10 of an;1 suitable form and a backing plate or dust cover 12 which is secured` to a 85 xed support 14 of any suitable construction. Three internal expanding brake shoes 16, 18 and 20 respectively are located in the same circumferential line about the inner face ofthe brake drum and are adapted to be moved outwardly into frictional engagementtherewith. The low. er brake shoe `18 has an arm 22 which extends upwardly and inwardly from oneV en d thereof and is pivoted-on a stud 24 'anchored to the support 14. VThe other end of 'said shoe has :4 5 spacedears 26 'between' which an ear 28 of the Y shoe 16 is received.' The shoes 18 and 16 .are

pivotally connectedV by the pin 30'which extends through .said ears. The upper end ,of said shoe 16 has a projection 32 for engage- WO. nient with a brake-actuating device, hereshown (Cl. 18S-250) as a cam 34, which is adapted to engage the end face`36 of said projection to force the shoe into engagement with the brake drum. The shoe 16 constitutes a servo shoe which is dragged down by 'the rotation. lof the brake drum into pressure applying relation4 with lthe shoe 18, whereby to force said bottom shoel against the drum. Said shoe 18 is returned to a normal inactive position free from the drum, when the brake settingpressure thereon is removed, by

a spring 38 which holds the shoe yieldingly yagainst an adjustable stop-member 40.

All shoes areprovidedwith friction linings 42. The shoe 20 which constitutes the main feature of the present' invention consistsl ofa Abody structurey having an arcuate ange 44 on the face of which the friction lining is secured. The body structure is provided with a strengthening rib 46 which is integral with and extends lengthwise of the arcuate ange 44 in the middle thereof and upstands from the rear face thereof, thusA prosection, as illustrated in Fig. 4. The free longitudinal edge of said rib is provided with an enlargedV strengthening head 48.

' Said rib extends beyond one end of said ange and is provided thereat with a pair of spaced projecting portions or arms 50 which are gener' ally parallel with each other and extend downwardly and inwardly of the body-structure of theshoe and have a recess or passage 52 therebetween through which the arm 2,2 of the shoe viding a body structure which is T-shaped in cross 18 is freely extended. The ends of said arms are integrally connectedy by a transversely-extended boss 54 which is located -in said passage 52 at the 'ends of said'arms and alsoextends outwardly' be- VVface 64 which confronts and is adapted to be en-v gaged by the camr34 to move the shoeY outwardly into engagement with the brake drum.

The brake-shoe thus described is strong and..

rigid in its Vconstruction and yet is-simple to make, I

has a. long bearing on its pivotal support, and thel supporting arms and projection'give good engagement with both the fixed support and the brake animating mechanism and are well able to withstand the forces which act thereon. n

A retractle spring 66 is extended vbetween the upper ends of said shoes 16 and 20 tov move them into anvvinactive position when the brake-applying pressurethereon is removed.v Y'

I claim: Abrake shoe having a. body structure and a means integrally connecting the ends of said arms.y

ERIK J. HIRVONEN.

`strengthening rib extended lengthwise thereof' which'has a pair of spaced arms at one end, and 

